266643144 has 128 divisors (see below), whose sum is σ = 762048000. Its totient is φ = 86363712.

The previous prime is 266643137. The next prime is 266643161. The reversal of 266643144 is 441346662.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 266643099 and 266643108.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1918227 + ... + 1918365.

It is an arithmetic number, because the mean of its divisors is an integer number (5953500).

Almost surely, 2^266643144 is an apocalyptic number.

266643144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266643144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381024000).

266643144 is an abundant number, since it is smaller than the sum of its proper divisors (495404856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266643144 is a wasteful number, since it uses less digits than its factorization.

266643144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 334 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 266643144 is about 16329.2113710369. The cubic root of 266643144 is about 643.6406634431.

The spelling of 266643144 in words is "two hundred sixty-six million, six hundred forty-three thousand, one hundred forty-four".